Rewritten parser that converts sudoers into a set of data structures.
This eliminates ordering issues and makes it possible to apply sudoers Defaults entries before searching for the command.
This commit is contained in:
Todd C. Miller
605
parse.c
605
parse.c
@@ -24,7 +24,6 @@
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <stdio.h>
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#ifdef STDC_HEADERS
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# include <stdlib.h>
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@@ -44,526 +43,204 @@
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif /* HAVE_UNISTD_H */
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#ifdef HAVE_FNMATCH
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# include <fnmatch.h>
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#endif /* HAVE_FNMATCH */
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#ifdef HAVE_EXTENDED_GLOB
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# include <glob.h>
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#endif /* HAVE_EXTENDED_GLOB */
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#ifdef HAVE_NETGROUP_H
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# include <netgroup.h>
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#endif /* HAVE_NETGROUP_H */
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#include <ctype.h>
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#include <pwd.h>
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#include <grp.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#ifdef HAVE_DIRENT_H
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# include <dirent.h>
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# define NAMLEN(dirent) strlen((dirent)->d_name)
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#else
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# define dirent direct
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# define NAMLEN(dirent) (dirent)->d_namlen
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# ifdef HAVE_SYS_NDIR_H
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# include <sys/ndir.h>
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# endif
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# ifdef HAVE_SYS_DIR_H
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# include <sys/dir.h>
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# endif
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# ifdef HAVE_NDIR_H
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# include <ndir.h>
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# endif
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#endif
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#include "sudo.h"
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#include "parse.h"
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#include "interfaces.h"
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#ifndef HAVE_FNMATCH
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# include "emul/fnmatch.h"
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#endif /* HAVE_FNMATCH */
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#ifndef HAVE_EXTENDED_GLOB
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# include "emul/glob.h"
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#endif /* HAVE_EXTENDED_GLOB */
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#include "gram.h"
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#ifndef lint
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static const char rcsid[] = "$Sudo$";
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#endif /* lint */
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/*
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* Globals
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* Parsed sudoers info.
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*/
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int parse_error = FALSE;
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extern int keepall;
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extern FILE *yyin, *yyout;
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extern struct userspec *userspecs;
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/*
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* Prototypes
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* Parse the specified sudoers file.
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*/
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static int has_meta __P((char *));
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int
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parse_sudoers(path)
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const char *path;
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{
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extern FILE *yyin;
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yyin = open_sudoers(_PATH_SUDOERS, NULL);
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init_parser(_PATH_SUDOERS, 0);
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return(yyparse());
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}
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/*
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* Look up the user in the sudoers file and check to see if they are
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* Look up the user in the parsed sudoers file and check to see if they are
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* allowed to run the specified command on this host as the target user.
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*/
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int
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sudoers_lookup(pwflag)
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int pwflag;
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{
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int error, nopass;
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enum def_tupple pwcheck;
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yyin = sudoers_fp;
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yyout = stdout;
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/* Allocate space for data structures in the parser. */
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init_parser(_PATH_SUDOERS);
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/* If pwcheck *could* be "all" or "any", keep more state. */
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if (pwflag > 0)
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keepall = TRUE;
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/* Need to be runas user while stat'ing things in the parser. */
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set_perms(PERM_RUNAS);
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error = yyparse();
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if (error || parse_error) {
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set_perms(PERM_ROOT);
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return(VALIDATE_ERROR);
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}
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int rval, validated, matched;
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enum def_tupple pwcheck = 0;
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struct cmndspec *cs;
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struct cmndtag *tags = NULL;
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struct privilege *priv;
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struct userspec *us;
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/*
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* The pw options may have changed during sudoers parse so we
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* wait until now to set this.
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* We use pwflag to tell us when a password should be required
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* for pseudo-commands. XXX - pass in pwcheck, not pwflag
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*/
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if (pwflag)
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pwcheck = (pwflag == -1) ? never : sudo_defs_table[pwflag].sd_un.tuple;
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else
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pwcheck = 0;
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/*
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* Assume the worst. If the stack is empty the user was
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* not mentioned at all.
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*/
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if (def_authenticate)
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error = VALIDATE_NOT_OK;
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else
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error = VALIDATE_NOT_OK | FLAG_NOPASS;
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if (pwcheck) {
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SET(error, FLAG_NO_CHECK);
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} else {
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SET(error, FLAG_NO_HOST);
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if (!top)
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SET(error, FLAG_NO_USER);
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}
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/* Assume the worst. */
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validated = VALIDATE_NOT_OK | FLAG_NO_HOST | FLAG_NO_USER;
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if (pwflag)
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SET(validated, FLAG_NO_CHECK);
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else if (!def_authenticate)
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validated |= FLAG_NOPASS;
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/*
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* Only check the actual command if pwflag is not set.
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* It is set for the "validate", "list" and "kill" pseudo-commands.
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* Always check the host and user.
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*/
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nopass = -1;
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if (pwflag) {
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int found;
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int nopass = UNSPEC;
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if (pwcheck == always && def_authenticate)
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nopass = FLAG_CHECK_USER;
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else if (pwcheck == never || !def_authenticate)
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nopass = FLAG_NOPASS;
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found = 0;
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while (top) {
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if (host_matches == TRUE) {
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found = 1;
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if (pwcheck == any && no_passwd == TRUE)
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nopass = FLAG_NOPASS;
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else if (pwcheck == all && nopass != 0)
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nopass = (no_passwd == TRUE) ? FLAG_NOPASS : 0;
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}
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top--;
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}
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if (found) {
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set_perms(PERM_ROOT);
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if (nopass == -1)
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nopass = 0;
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return(VALIDATE_OK | nopass);
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}
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} else {
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while (top) {
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if (host_matches == TRUE) {
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CLR(error, FLAG_NO_HOST);
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if (runas_matches == TRUE && cmnd_matches == TRUE) {
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/*
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* User was granted access to cmnd on host as user.
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*/
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set_perms(PERM_ROOT);
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return(VALIDATE_OK |
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(no_passwd == TRUE ? FLAG_NOPASS : 0) |
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(no_execve == TRUE ? FLAG_NOEXEC : 0) |
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(monitor_cmnd == TRUE ? FLAG_MONITOR : 0));
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} else if ((runas_matches == TRUE && cmnd_matches == FALSE) ||
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(runas_matches == FALSE && cmnd_matches == TRUE)) {
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/*
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* User was explicitly denied access to cmnd on host.
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*/
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set_perms(PERM_ROOT);
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return(VALIDATE_NOT_OK |
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(no_passwd == TRUE ? FLAG_NOPASS : 0) |
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(no_execve == TRUE ? FLAG_NOEXEC : 0) |
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(monitor_cmnd == TRUE ? FLAG_MONITOR : 0));
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CLR(validated, FLAG_NO_USER);
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CLR(validated, FLAG_NO_HOST);
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matched = FALSE;
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for (us = userspecs; us != NULL; us = us->next) {
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if (user_matches(sudo_user.pw, us->user) == TRUE) {
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priv = us->privileges;
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if (host_matches(user_shost, user_host, priv->hostlist) == TRUE) {
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matched = TRUE;
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for (cs = priv->cmndlist; cs != NULL; cs = cs->next) {
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if ((pwcheck == any && nopass != TRUE) ||
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(pwcheck == all && nopass == TRUE))
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nopass = cs->tags.nopasswd;
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}
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}
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}
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top--;
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}
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if (matched == TRUE) {
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/* User has an entry for this host. */
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CLR(validated, VALIDATE_NOT_OK);
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SET(validated, VALIDATE_OK);
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if (pwcheck == always && def_authenticate)
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SET(validated, FLAG_CHECK_USER);
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else if (pwcheck == never || !def_authenticate || nopass == TRUE)
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SET(validated, FLAG_NOPASS);
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}
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return(validated);
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}
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/* Need to be runas user while stat'ing things. */
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set_perms(PERM_RUNAS);
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matched = UNSPEC;
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for (us = userspecs; us != NULL; us = us->next) {
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if (user_matches(sudo_user.pw, us->user) == TRUE) {
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CLR(validated, FLAG_NO_USER);
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priv = us->privileges;
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if (host_matches(user_shost, user_host, priv->hostlist) == TRUE) {
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CLR(validated, FLAG_NO_HOST);
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for (cs = priv->cmndlist; cs != NULL; cs = cs->next) {
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if (runas_matches(runas_pw, cs->runaslist) == TRUE) {
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rval = cmnd_matches(user_cmnd, user_args, cs->cmnd);
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if (rval != UNSPEC) {
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matched = rval;
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tags = &cs->tags;
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}
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}
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}
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}
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}
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}
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if (matched == TRUE) {
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CLR(validated, VALIDATE_NOT_OK);
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SET(validated, VALIDATE_OK);
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if (tags != NULL) {
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if (tags->nopasswd == TRUE)
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SET(validated, FLAG_NOPASS);
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if (tags->noexec == TRUE)
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SET(validated, FLAG_NOEXEC);
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if (tags->monitor == TRUE)
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SET(validated, FLAG_MONITOR);
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}
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}
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set_perms(PERM_ROOT);
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/*
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* The user was neither explicitly granted nor denied access.
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*/
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if (nopass == -1)
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nopass = 0;
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return(error | nopass);
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return(validated);
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}
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/*
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* If path doesn't end in /, return TRUE iff cmnd & path name the same inode;
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* otherwise, return TRUE if user_cmnd names one of the inodes in path.
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* Print out privileges for the specified user.
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*/
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int
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command_matches(sudoers_cmnd, sudoers_args)
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char *sudoers_cmnd;
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char *sudoers_args;
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{
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struct stat sudoers_stat;
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struct dirent *dent;
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char **ap, *base, buf[PATH_MAX];
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glob_t gl;
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DIR *dirp;
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/* Check for pseudo-commands */
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if (strchr(user_cmnd, '/') == NULL) {
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/*
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* Return true if both sudoers_cmnd and user_cmnd are "sudoedit" AND
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* a) there are no args in sudoers OR
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* b) there are no args on command line and none req by sudoers OR
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* c) there are args in sudoers and on command line and they match
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*/
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if (strcmp(sudoers_cmnd, "sudoedit") != 0 ||
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strcmp(user_cmnd, "sudoedit") != 0)
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return(FALSE);
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if (!sudoers_args ||
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(!user_args && sudoers_args && !strcmp("\"\"", sudoers_args)) ||
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(sudoers_args &&
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fnmatch(sudoers_args, user_args ? user_args : "", 0) == 0)) {
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if (safe_cmnd)
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free(safe_cmnd);
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safe_cmnd = estrdup(sudoers_cmnd);
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return(TRUE);
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} else
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return(FALSE);
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}
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/*
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* If sudoers_cmnd has meta characters in it, use fnmatch(3)
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* to do the matching.
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*/
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if (has_meta(sudoers_cmnd)) {
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/*
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* Return true if we find a match in the glob(3) results AND
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* a) there are no args in sudoers OR
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* b) there are no args on command line and none required by sudoers OR
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* c) there are args in sudoers and on command line and they match
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* else return false.
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*
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* Could optimize patterns ending in "/*" to "/user_base"
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*/
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#define GLOB_FLAGS (GLOB_NOSORT | GLOB_MARK | GLOB_BRACE | GLOB_TILDE)
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if (glob(sudoers_cmnd, GLOB_FLAGS, NULL, &gl) != 0) {
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globfree(&gl);
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return(FALSE);
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}
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/* For each glob match, compare basename, st_dev and st_ino. */
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for (ap = gl.gl_pathv; *ap != NULL; ap++) {
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/* only stat if basenames are the same */
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if ((base = strrchr(*ap, '/')) != NULL)
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base++;
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else
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base = *ap;
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if (strcmp(user_base, base) != 0 ||
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stat(*ap, &sudoers_stat) == -1)
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continue;
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if (user_stat->st_dev == sudoers_stat.st_dev &&
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user_stat->st_ino == sudoers_stat.st_ino) {
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if (safe_cmnd)
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free(safe_cmnd);
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safe_cmnd = estrdup(*ap);
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break;
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}
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}
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globfree(&gl);
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if (*ap == NULL)
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return(FALSE);
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if (!sudoers_args ||
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(!user_args && sudoers_args && !strcmp("\"\"", sudoers_args)) ||
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(sudoers_args &&
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fnmatch(sudoers_args, user_args ? user_args : "", 0) == 0)) {
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if (safe_cmnd)
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free(safe_cmnd);
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safe_cmnd = estrdup(user_cmnd);
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return(TRUE);
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} else
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return(FALSE);
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} else {
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size_t dlen = strlen(sudoers_cmnd);
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/*
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* No meta characters
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* Check to make sure this is not a directory spec (doesn't end in '/')
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*/
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if (sudoers_cmnd[dlen - 1] != '/') {
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/* Only proceed if user_base and basename(sudoers_cmnd) match */
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if ((base = strrchr(sudoers_cmnd, '/')) == NULL)
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base = sudoers_cmnd;
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else
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base++;
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if (strcmp(user_base, base) != 0 ||
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stat(sudoers_cmnd, &sudoers_stat) == -1)
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return(FALSE);
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/*
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* Return true if inode/device matches AND
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* a) there are no args in sudoers OR
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* b) there are no args on command line and none req by sudoers OR
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* c) there are args in sudoers and on command line and they match
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*/
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if (user_stat->st_dev != sudoers_stat.st_dev ||
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user_stat->st_ino != sudoers_stat.st_ino)
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return(FALSE);
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if (!sudoers_args ||
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(!user_args && sudoers_args && !strcmp("\"\"", sudoers_args)) ||
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(sudoers_args &&
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fnmatch(sudoers_args, user_args ? user_args : "", 0) == 0)) {
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if (safe_cmnd)
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free(safe_cmnd);
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safe_cmnd = estrdup(sudoers_cmnd);
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return(TRUE);
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} else
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return(FALSE);
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}
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/*
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* Grot through sudoers_cmnd's directory entries, looking for user_base.
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*/
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dirp = opendir(sudoers_cmnd);
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if (dirp == NULL)
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return(FALSE);
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if (strlcpy(buf, sudoers_cmnd, sizeof(buf)) >= sizeof(buf))
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return(FALSE);
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while ((dent = readdir(dirp)) != NULL) {
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/* ignore paths > PATH_MAX (XXX - log) */
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buf[dlen] = '\0';
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if (strlcat(buf, dent->d_name, sizeof(buf)) >= sizeof(buf))
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continue;
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/* only stat if basenames are the same */
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if (strcmp(user_base, dent->d_name) != 0 ||
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stat(buf, &sudoers_stat) == -1)
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continue;
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if (user_stat->st_dev == sudoers_stat.st_dev &&
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user_stat->st_ino == sudoers_stat.st_ino) {
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if (safe_cmnd)
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free(safe_cmnd);
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safe_cmnd = estrdup(buf);
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break;
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}
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}
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closedir(dirp);
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return(dent != NULL);
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}
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}
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/*
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* Returns TRUE if "n" is one of our ip addresses or if
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* "n" is a network that we are on, else returns FALSE.
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*/
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int
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addr_matches(n)
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char *n;
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{
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int i;
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char *m;
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struct in_addr addr, mask;
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/* If there's an explicit netmask, use it. */
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if ((m = strchr(n, '/'))) {
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*m++ = '\0';
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addr.s_addr = inet_addr(n);
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if (strchr(m, '.'))
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mask.s_addr = inet_addr(m);
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else {
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i = 32 - atoi(m);
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mask.s_addr = 0xffffffff;
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mask.s_addr >>= i;
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mask.s_addr <<= i;
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mask.s_addr = htonl(mask.s_addr);
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}
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*(m - 1) = '/';
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for (i = 0; i < num_interfaces; i++)
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if ((interfaces[i].addr.s_addr & mask.s_addr) == addr.s_addr)
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return(TRUE);
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} else {
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addr.s_addr = inet_addr(n);
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for (i = 0; i < num_interfaces; i++)
|
||||
if (interfaces[i].addr.s_addr == addr.s_addr ||
|
||||
(interfaces[i].addr.s_addr & interfaces[i].netmask.s_addr)
|
||||
== addr.s_addr)
|
||||
return(TRUE);
|
||||
}
|
||||
|
||||
return(FALSE);
|
||||
}
|
||||
|
||||
/*
|
||||
* Returns 0 if the hostname matches the pattern and non-zero otherwise.
|
||||
*/
|
||||
int
|
||||
hostname_matches(shost, lhost, pattern)
|
||||
char *shost;
|
||||
char *lhost;
|
||||
char *pattern;
|
||||
{
|
||||
if (has_meta(pattern)) {
|
||||
if (strchr(pattern, '.'))
|
||||
return(fnmatch(pattern, lhost, FNM_CASEFOLD));
|
||||
else
|
||||
return(fnmatch(pattern, shost, FNM_CASEFOLD));
|
||||
} else {
|
||||
if (strchr(pattern, '.'))
|
||||
return(strcasecmp(lhost, pattern));
|
||||
else
|
||||
return(strcasecmp(shost, pattern));
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Returns TRUE if the user/uid from sudoers matches the specified user/uid,
|
||||
* else returns FALSE.
|
||||
*/
|
||||
int
|
||||
userpw_matches(sudoers_user, user, pw)
|
||||
char *sudoers_user;
|
||||
char *user;
|
||||
void
|
||||
display_privs(pw)
|
||||
struct passwd *pw;
|
||||
{
|
||||
if (pw != NULL && *sudoers_user == '#') {
|
||||
uid_t uid = atoi(sudoers_user + 1);
|
||||
if (uid == pw->pw_uid)
|
||||
return(1);
|
||||
}
|
||||
return(strcmp(sudoers_user, user) == 0);
|
||||
}
|
||||
struct cmndspec *cs;
|
||||
struct member *m, *runas;
|
||||
struct privilege *priv;
|
||||
struct userspec *us;
|
||||
|
||||
/*
|
||||
* Returns TRUE if the given user belongs to the named group,
|
||||
* else returns FALSE.
|
||||
* XXX - reduce the number of passwd/group lookups
|
||||
*/
|
||||
int
|
||||
usergr_matches(group, user, pw)
|
||||
char *group;
|
||||
char *user;
|
||||
struct passwd *pw;
|
||||
{
|
||||
struct group *grp;
|
||||
gid_t pw_gid;
|
||||
char **cur;
|
||||
printf("User %s may run the following commands on this host:\n",
|
||||
pw->pw_name);
|
||||
|
||||
/* make sure we have a valid usergroup, sudo style */
|
||||
if (*group++ != '%')
|
||||
return(FALSE);
|
||||
for (us = userspecs; us != NULL; us = us->next) {
|
||||
if (user_matches(pw, us->user) != TRUE ||
|
||||
host_matches(user_shost, user_host, us->privileges->hostlist) != TRUE)
|
||||
continue;
|
||||
|
||||
/* look up user's primary gid in the passwd file */
|
||||
if (pw == NULL && (pw = getpwnam(user)) == NULL)
|
||||
return(FALSE);
|
||||
pw_gid = pw->pw_gid;
|
||||
|
||||
if ((grp = getgrnam(group)) == NULL)
|
||||
return(FALSE);
|
||||
|
||||
/* check against user's primary (passwd file) gid */
|
||||
if (grp->gr_gid == pw_gid)
|
||||
return(TRUE);
|
||||
|
||||
/* check to see if user is explicitly listed in the group */
|
||||
for (cur = grp->gr_mem; *cur; cur++) {
|
||||
if (strcmp(*cur, user) == 0)
|
||||
return(TRUE);
|
||||
}
|
||||
|
||||
return(FALSE);
|
||||
}
|
||||
|
||||
/*
|
||||
* Returns TRUE if "host" and "user" belong to the netgroup "netgr",
|
||||
* else return FALSE. Either of "host", "shost" or "user" may be NULL
|
||||
* in which case that argument is not checked...
|
||||
*/
|
||||
int
|
||||
netgr_matches(netgr, host, shost, user)
|
||||
char *netgr;
|
||||
char *host;
|
||||
char *shost;
|
||||
char *user;
|
||||
{
|
||||
#ifdef HAVE_GETDOMAINNAME
|
||||
static char *domain = (char *) -1;
|
||||
#else
|
||||
static char *domain = NULL;
|
||||
#endif /* HAVE_GETDOMAINNAME */
|
||||
|
||||
/* make sure we have a valid netgroup, sudo style */
|
||||
if (*netgr++ != '+')
|
||||
return(FALSE);
|
||||
|
||||
#ifdef HAVE_GETDOMAINNAME
|
||||
/* get the domain name (if any) */
|
||||
if (domain == (char *) -1) {
|
||||
domain = (char *) emalloc(MAXHOSTNAMELEN);
|
||||
if (getdomainname(domain, MAXHOSTNAMELEN) == -1 || *domain == '\0') {
|
||||
free(domain);
|
||||
domain = NULL;
|
||||
priv = us->privileges;
|
||||
runas = NULL;
|
||||
for (cs = priv->cmndlist; cs != NULL; cs = cs->next) {
|
||||
fputs(" ", stdout);
|
||||
if (cs->runaslist != NULL)
|
||||
runas = cs->runaslist;
|
||||
if (runas != NULL) {
|
||||
fputs("(", stdout);
|
||||
for (m = runas; m != NULL; m = m->next) {
|
||||
if (m != runas)
|
||||
fputs(", ", stdout);
|
||||
print_member(m);
|
||||
}
|
||||
fputs(") ", stdout);
|
||||
}
|
||||
if (cs->tags.monitor != UNSPEC && cs->tags.monitor != def_monitor)
|
||||
printf("%sMONITOR: ", cs->tags.monitor ? "" : "NO");
|
||||
if (cs->tags.noexec != UNSPEC && cs->tags.noexec != def_noexec)
|
||||
printf("%sEXEC: ", cs->tags.noexec ? "NO" : "");
|
||||
if (cs->tags.nopasswd != UNSPEC && cs->tags.nopasswd != !def_authenticate)
|
||||
printf("%sPASSWD: ", cs->tags.nopasswd ? "NO" : "");
|
||||
print_member(cs->cmnd);
|
||||
putchar('\n');
|
||||
}
|
||||
}
|
||||
#endif /* HAVE_GETDOMAINNAME */
|
||||
|
||||
#ifdef HAVE_INNETGR
|
||||
if (innetgr(netgr, host, user, domain))
|
||||
return(TRUE);
|
||||
else if (host != shost && innetgr(netgr, shost, user, domain))
|
||||
return(TRUE);
|
||||
#endif /* HAVE_INNETGR */
|
||||
|
||||
return(FALSE);
|
||||
}
|
||||
|
||||
/*
|
||||
* Returns TRUE if "s" has shell meta characters in it,
|
||||
* else returns FALSE.
|
||||
* Print the contents of a struct member to stdout
|
||||
*/
|
||||
static int
|
||||
has_meta(s)
|
||||
char *s;
|
||||
void
|
||||
print_member(m)
|
||||
struct member *m;
|
||||
{
|
||||
char *t;
|
||||
|
||||
for (t = s; *t; t++) {
|
||||
if (*t == '\\' || *t == '?' || *t == '*' || *t == '[' || *t == ']')
|
||||
return(TRUE);
|
||||
struct sudo_command *c;
|
||||
|
||||
if (m->negated)
|
||||
printf("!");
|
||||
if (m->name == NULL)
|
||||
printf("ALL");
|
||||
else if (m->type != COMMAND)
|
||||
printf("%s", m->name);
|
||||
else {
|
||||
c = (struct sudo_command *) m->name;
|
||||
printf("%s%s%s", c->cmnd, c->args ? " " : "",
|
||||
c->args ? c->args : "");
|
||||
}
|
||||
return(FALSE);
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user